Remove xml:base support

LayoutTests/svg/custom/image-base-uri.svg

Index: LayoutTests/svg/custom/image-base-uri.svg
diff --git a/LayoutTests/svg/custom/image-base-uri.svg b/LayoutTests/svg/custom/image-base-uri.svg
deleted file mode 100644
index baec4bb547787b6e40bce3a6bd6411017d68fbcd..0000000000000000000000000000000000000000
--- a/LayoutTests/svg/custom/image-base-uri.svg
+++ /dev/null
@@ -1,22 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<svg xmlns="http://www.w3.org/2000/svg">
-  <script type="text/javascript">
-  <![CDATA[
-    if (window.testRunner)
-        testRunner.dumpAsText();
-    var txt = document.createElementNS('http://www.w3.org/2000/svg', "text");
-    txt.setAttribute("id", "console");
-    txt.textContent = "PASS";
-    document.rootElement.appendChild(txt);
-    var ie = document.createElementNS('http://www.w3.org/2000/svg', "image");
-    ie.onerror = function() { document.getElementById("console").textContent = "FAIL"; }
-    ie.setAttribute("x", "0");
-    ie.setAttribute("y", "0");
-    ie.setAttribute("width", "100");
-    ie.setAttribute("height", "100");
-    ie.setAttributeNS("http://www.w3.org/XML/1998/namespace", "xml:base", "resources/");
-    ie.setAttributeNS("http://www.w3.org/1999/xlink", "xlink:href", "green-checker.png");
-    document.rootElement.appendChild(ie);
-  ]]>
-  </script>
-</svg>